def test_user_affinity(spark, demo_usage_data, sar_settings, header):
time_now = demo_usage_data[header["col_timestamp"]].max()
model = SARPlus(spark,
**header,
timedecay_formula=True,
time_decay_coefficient=30,
time_now=time_now,
similarity_type="cooccurrence")
df = spark.createDataFrame(demo_usage_data)
model.fit(df)
user_affinity_ref = pd.read_csv(sar_settings["FILE_DIR"] + "user_aff.csv")
user_affinity_ref = pd.melt(user_affinity_ref,
user_affinity_ref.columns[0],
user_affinity_ref.columns[1:], 'ItemId',
'Rating')
user_affinity_ref = user_affinity_ref[user_affinity_ref.Rating > 0]\
.reset_index(drop=True)
# construct dataframe with test user id we'd like to get the affinity for
df_test = spark.createDataFrame(
pd.DataFrame({header['col_user']: [sar_settings["TEST_USER_ID"]]}))
user_affinity = model.get_user_affinity(df_test).toPandas().reset_index(
drop=True)
# verify the that item ids are the same
assert (
user_affinity[header['col_item']] == user_affinity_ref.ItemId).all()
assert np.allclose(user_affinity_ref[header['col_rating']].values,
user_affinity['Rating'].values,
atol=sar_settings["ATOL"])
def test_e2e(spark, pandas_dummy_dataset, header):
sar = SARPlus(spark, **header)
df = spark.createDataFrame(pandas_dummy_dataset)
sar.fit(df)
test_df = spark.createDataFrame(
pd.DataFrame({header["col_user"]: [3], header["col_item"]: [2]})
)
r1 = (
sar.recommend_k_items_slow(test_df, top_k=3, remove_seen=False)
.toPandas()
.sort_values([header["col_user"], header["col_item"]])
.reset_index(drop=True)
)
r2 = (
sar.recommend_k_items(
test_df,
"tests/test_e2e_cache",
top_k=3,
n_user_prediction_partitions=2,
remove_seen=False,
)
.toPandas()
.sort_values([header["col_user"], header["col_item"]])
.reset_index(drop=True)
)
assert (r1.iloc[:, :2] == r2.iloc[:, :2]).all().all()
assert np.allclose(r1.score.values, r2.score.values, 1e-3)
def test_e2e(spark, pandas_dummy_dataset, header):
sar = SARPlus(spark, **header)
df = spark.createDataFrame(pandas_dummy_dataset)
sar.fit(df)
# assert 4*4 + 32 == sar.item_similarity.count()
# print(sar.item_similarity
# .toPandas()
# .pivot_table(index='i1', columns='i2', values='value'))
test_df = spark.createDataFrame(
pd.DataFrame({
header['col_user']: [3],
header['col_item']: [2]
}))
r1 = sar.recommend_k_items_slow(test_df, top_k=3, remove_seen=False)\
.toPandas()\
.sort_values([header['col_user'], header['col_item']])\
.reset_index(drop=True)
r2 = sar.recommend_k_items(test_df, "tests/test_e2e_cache", top_k=3, n_user_prediction_partitions=2, remove_seen=False)\
.toPandas()\
.sort_values([header['col_user'], header['col_item']])\
.reset_index(drop=True)
assert (r1.iloc[:, :2] == r2.iloc[:, :2]).all().all()
assert np.allclose(r1.score.values, r2.score.values, 1e-3)
def test_userpred(
spark, threshold, similarity_type, file, header, sar_settings, demo_usage_data
):
time_now = demo_usage_data[header["col_timestamp"]].max()
test_id = "{0}_{1}_{2}".format(threshold, similarity_type, file)
model = SARPlus(
spark,
**header,
table_prefix=test_id,
timedecay_formula=True,
time_decay_coefficient=30,
time_now=time_now,
threshold=threshold,
similarity_type=similarity_type
)
df = spark.createDataFrame(demo_usage_data)
model.fit(df)
url = (
sar_settings["FILE_DIR"]
+ "userpred_"
+ file
+ str(threshold)
+ "_userid_only.csv"
)
pred_ref = pd.read_csv(url)
pred_ref = (
pd.wide_to_long(pred_ref, ["rec", "score"], "user", "idx")
.sort_values("score", ascending=False)
.reset_index(drop=True)
)
# Note: it's important to have a separate cache_path for each run as they're interferring with each other
pred = model.recommend_k_items(
spark.createDataFrame(
demo_usage_data[
demo_usage_data[header["col_user"]] == sar_settings["TEST_USER_ID"]
]
),
cache_path="test_userpred-" + test_id,
top_k=10,
n_user_prediction_partitions=1,
)
pred = pred.toPandas().sort_values("score", ascending=False).reset_index(drop=True)
assert (pred.MovieId.values == pred_ref.rec.values).all()
assert np.allclose(
pred.score.values, pred_ref.score.values, atol=sar_settings["ATOL"]
)
def test_sar_item_similarity(
spark,
threshold,
similarity_type,
file,
demo_usage_data,
sar_settings,
header,
):
model = SARPlus(
spark,
**header,
timedecay_formula=False,
time_decay_coefficient=30,
time_now=None,
threshold=threshold,
similarity_type=similarity_type,
)
df = spark.createDataFrame(demo_usage_data)
model.fit(df)
# reference
item_similarity_ref = pd.read_csv(sar_settings["FILE_DIR"] + "sim_" +
file + str(threshold) + ".csv")
item_similarity_ref = pd.melt(
item_similarity_ref,
item_similarity_ref.columns[0],
item_similarity_ref.columns[1:],
"i2",
"value",
)
item_similarity_ref.columns = ["i1", "i2", "value"]
item_similarity_ref = (
item_similarity_ref[item_similarity_ref.value > 0].sort_values(
["i1", "i2"]).reset_index(drop=True))
# actual
item_similarity = (model.item_similarity.toPandas().sort_values(
["i1", "i2"]).reset_index(drop=True))
if similarity_type == "cooccurrence":
assert (item_similarity_ref == item_similarity).all().all()
else:
assert ((item_similarity.iloc[:, :1] == item_similarity_ref.iloc[:, :1]
).all().all())
assert np.allclose(
item_similarity.value.values,
item_similarity_ref.value.values,
atol=sar_settings["ATOL"],
)
def test_fit(spark, similarity_type, timedecay_formula,
train_test_dummy_timestamp, header):
model = SARPlus(spark, **header)
trainset, testset = train_test_dummy_timestamp
df = spark.createDataFrame(trainset)
df.write.mode("overwrite").saveAsTable("trainset")
df = spark.table("trainset")
model.fit(df,
timedecay_formula=timedecay_formula,
similarity_type=similarity_type)
def test_sar_item_similarity(spark, threshold, similarity_type, file,
demo_usage_data, sar_settings, header):
model = SARPlus(spark,
**header,
timedecay_formula=False,
time_decay_coefficient=30,
time_now=None,
threshold=threshold,
similarity_type=similarity_type)
df = spark.createDataFrame(demo_usage_data)
model.fit(df)
# reference
item_similarity_ref = pd.read_csv(sar_settings["FILE_DIR"] + "sim_" +
file + str(threshold) + ".csv")
item_similarity_ref = pd.melt(item_similarity_ref,
item_similarity_ref.columns[0],
item_similarity_ref.columns[1:], 'i2',
'value')
item_similarity_ref.columns = ['i1', 'i2', 'value']
item_similarity_ref = item_similarity_ref[item_similarity_ref.value > 0]\
.sort_values(['i1', 'i2'])\
.reset_index(drop=True)\
# actual
item_similarity = model.item_similarity\
.toPandas()\
.sort_values(['i1', 'i2'])\
.reset_index(drop=True)
if similarity_type is "cooccurrence":
assert ((item_similarity_ref == item_similarity).all().all())
else:
assert ((item_similarity.iloc[:, :1] == item_similarity_ref.iloc[:, :1]
).all().all())
assert np.allclose(item_similarity.value.values,
item_similarity_ref.value.values)
from pysarplus import SARPlus, SARModel
# spark dataframe with user/item/rating/optional timestamp tuples
train_df = spark.createDataFrame([
(1, 1, 1),
(1, 2, 1),
(2, 1, 1),
(3, 1, 1),
(3, 3, 1)],
['user_id', 'item_id', 'rating'])
# spark dataframe with user/item tuples
test_df = spark.createDataFrame([
(1, 1, 1),
(3, 3, 1)],
['user_id', 'item_id', 'rating'])
model = SARPlus(
spark,
col_user='******',
col_item='item_id',
col_rating='rating',
similarity_type='jaccard',
)
model.fit(train_df)
model.recommend_k_items(test_df, 'sarplus_cache', top_k=3).show()